<%@page import="javax.imageio.ImageIO"%>
<%@ page language="java" contentType="image/jpeg;charset=UTF-8"%>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*"%>
<%!private boolean drawBgFlag = false;
	private int rBg = 0;
	private int gBg = 0;
	private int bBg = 0;
	private static final int HEIGHT = 30;
	private static final int FONT_NUM = 4;
	private int iNum = 4;
	private static final String CODE_LIST = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
	public Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255) {
			fc = 255;
		}
		if (bc > 255) {
			bc = 255;
		}
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
	public void setBgCloor(int r, int g, int b) {
		drawBgFlag = true;
		this.rBg = r;
		this.gBg = g;
		this.bBg = b;
	}%>

<%
	response.setHeader("Pragma", "No-cache");
	response.setHeader("Cache-Control", "no-cache");
	response.setDateHeader("Expires", 0);
	int width = 70;
	int height = 30;
	BufferedImage image = new BufferedImage(width, height,
			BufferedImage.TYPE_INT_RGB);
	Graphics g = image.getGraphics();
	Random random = new Random();
	if (drawBgFlag) {
		g.setColor(new Color(rBg, gBg, bBg));
		g.fillRect(0, 0, width, HEIGHT);
	} else {
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, HEIGHT);
		for (int i = 0; i < 155; i++) {
			g.setColor(getRandColor(140, 200));
			int x = random.nextInt(width);
			int y = random.nextInt(HEIGHT);
			int x1 = random.nextInt(12);
			int y1 = random.nextInt(12);
			g.drawLine(x, y, x + x1, y + y1);
		}
	}
	
	g.setFont(new Font("Times New Roman", Font.PLAIN, 24));
	String sRand = "";
	for (int i = 0; i < iNum; i++) {
		int rand = random.nextInt(CODE_LIST.length());
		String strRand = CODE_LIST.substring(rand, rand + 1);
		sRand += strRand;
		g.setColor(new Color(20 + random.nextInt(110), 20 + random
				.nextInt(110), 20 + random.nextInt(110)));
		g.drawString(strRand, 13 * i + 8, 24);
	}
	g.dispose();
	session.setAttribute("imgRand", sRand.toString());
	ImageIO.write(image, "JPEG", response.getOutputStream());
	out.clear();
	out = pageContext.pushBody();
	//System.out.println(session.getAttribute("imgRand"));
%>
